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Internal cargo lights switch on the P43 forward cargo door control panel.
The sill lights will also come on when the cargo door is fully open and the door between the forward cargo compartment and the main equipment center is open.
When these conditions are true, the forward sill door lights relay in the P35 energizes and makes the lights come on.
Power
The ground handling bus must have power for the lights to operate.
Transformer
There is a transformer that decreases the voltage that goes to the lights from 115v ac to 28v ac.
Proximity Sensor Electronics Unit (PSEU)
Proximity sensors on the door (not shown) send information about door position to the PSEU. The PSEU controls relays in the P35 panel.
See the forward large cargo door section for more information about the proximity sensors (SECTION 52-34).
Aft Cargo Loading Lights
The aft cargo loading lights operate almost the same way as the forward lights. These switches (not shown) control the aft lights:
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Aft interior cargo lights switch on the P44 aft cargo door control panel
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Bulk-aft interior lights switch
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Aft interior cargo lights switch by the P39 aft cargo handling accessory panel
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Bulk cargo door closed, latched, and locked switch
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Aft cargo exterior area lights switch on the P44.
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SERVICE AND CARGO LOADING LIGHTS -CARGO LOADING LIGHTS -FUNCTIONAL DESCRIPTION
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SERVICE AND CARGO LOADING LIGHTS -BULK CARGO LOADING LIGHTS -FUNCTIONAL DESCRIPTION
Functional Description
Power goes from the P320 ground service/handling power panel to a circuit breaker in the P39 aft cargo handling accessory panel. When the bulk cargo external light switch is in the ON position, the power goes to a transformer and then to the external lights.
Power
The ground handling bus must have power for the lights to operate.
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
LOWER LOBE CARGO COMPARTMENT LIGHTS -INTRODUCTION
Purpose
The lower lobe cargo compartment lights give light in the forward, aft, and bulk cargo compartments.
Location
The lights are in the ceiling of the cargo compartments and in the sidewall near the bulk cargo door (not shown). There are light switches in these locations:
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On the exterior door control panels
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Near the door in the interior of the compartments
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Near the access panel to the main equipment center (MEC).
There are relays and transformers in the P35 and P39 forward and aft cargo handling accessory panels.
See the service and cargo loading lights section for more information about the relays and transformers (SECTION 33-31).
Interface
The cargo lights use information from a proximity sensor electronics unit (PSEU). Power for the lights comes from the cargo system controllers.
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LOWER LOBE CARGO COMPARTMENT LIGHTS -COMPARTMENT LIGHTS
Location
The lights are in the ceiling of the forward, aft, and bulk cargo compartments. There is also a light near the forward edge of the bulk cargo compartment door.
Physical Description
Each light has a:
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Lamp
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Grill
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Lens
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Ring
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Fastener (4)
* 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：777 AMM 飞机维护手册 灯 Lights(31)
